I think their open graph protocol is a little simpler and easier to use than rdf/microformats -- I think they were aiming for simplicity over completeness. You

I think their open graph protocol is a little simpler and easier to use than rdf/microformats -- I think they were aiming for simplicity over completeness. You can represent pretty complicated structured data with rdf/microformats. Sometimes simplicity wins over completeness. See http://www.jwz.org/doc/worse-is-better.html http://www.jwz.org/doc/worse-is-better.html